Pot your gardenia in a potting mix that allows for good drainage and never let the plant sit in water. Keep the potting mix evenly moist. Gardenias need an acidic soil, and should be fertilized with a blend formulated specifically for acid-loving plants. You’ll want to keep humidity higher than for your typical houseplant; this can be achieved with a humidity tray or by using a humidifier. Misting and grouping with other plants may also be helpful.
Another preference gardenias have is for cool night-time temperatures. If you can provide temperatures in the low 60s during the night, you will have a much happier plant. Temperatures should not be much higher than somewhere in the low 70s during the day.
Whitefly, aphids, spider mites are all potential pests of your gardenia. Spider mites can be deterred somewhat if the humidity is kept high. Checking for pests before bringing your plant home is of the utmost importance; if you bring a plant home that has an infestation, the treatment may be too harsh for the plant to handle. A healthy plant in a healthy environment is the key to getting your gardenia to thrive.
Gardenias can be propagated from softwood cuttings, pretty much any time of year. Remove any flowers or flower buds from the portion of stem being used to propagate. Keep the cuttings in a protected, humid environment, especially while the roots are still developing. Once roots are well established, pot up in groups of three or four small plants. The grouping will help the little plants fare better while they are growing and will result in much nicer adult-sided plants when they are established.
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